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| Subject: | LF: Re: adding a L into a 300m LF vertical? |
| From: | "James Moritz" <[email protected]> |
| Date: | Thu, 6 Jan 2011 21:33:28 -0000 |
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Dear Stefan, LF Group, _Questions:_ Is my calculation reasonably useful? Would YOU add that coil in a height of 100m above GND? I have found with NEC simulations that they give you a reasonable idea of the impedance, but not a precise value. Especially for the resistance, where there are many unknowns - NEC really only sets a lower limit. On the basis of the calculations, I would first try without the coil, then if results are as expected, I would try it with the coil. Otherwise there are too many variables to make sense of the experiment - if the coil goes up and the impedance is totally different from the calculation, is it because of the coil, the antenna, or the calculation? I tend to let it be since the improvement isn't that much and the effort is high. Furthermore the coil losses could be higher since i have to use a thin wire to keep the weight small... Yes - the 136k coils I have made with Q > 300 have been rather big, either with RF Litz wire or thick solid wire. Hope to see some signals at the weekend, Cheers, Jim Moritz 73 de M0BMU |
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